The document discusses two major classification systems used in psychiatry: the International Classification of Diseases (ICD) published by the World Health Organization, and the Diagnostic and Statistical Manual of Mental Disorders (DSM) published by the American Psychiatric Association. The ICD-10 is currently used and organizes mental disorders under chapter F, while the recently released DSM-5 reorganized disorders into chapters without the previous multiaxial assessment. Both classification systems aim to clearly define diagnoses, provide a common language for professionals, and offer effective treatment.